\begin{tikzpicture}
	\begin{pgfonlayer}{nodelayer}
		\node [style=none] (0) at (-4, 5.5) {};
		\node [style=node small] (1) at (0, 5.5) {$c_0$};
		\node [style=node small] (2) at (2.75, 3.25) {$c_1$};
		\node [style=node small] (3) at (-6.75, 3.25) {$c_3$};
		\node [style=none] (4) at (-8, 0) {};
		\node [style=node small] (5) at (-6.75, -3.25) {$c_5$};
		\node [style=node small] (6) at (-4, -6) {$c_6$};
		\node [style=node small] (7) at (0, -6) {$c_4$};
		\node [style=none] (8) at (4, 0) {};
		\node [style=none] (9) at (2.75, -3.25) {};
		\node [style=none] (10) at (0.25, 5) {};
		\node [style=none] (11) at (1.5, 4) {};
		\node [style=none] (12) at (1.25, 3.5) {};
		\node [style=none] (13) at (-5.75, 3.5) {};
		\node [style=none] (14) at (-5.75, 2.25) {};
		\node [style=none] (15) at (-0.5, -5) {};
		\node [style=none] (16) at (-1.25, -5.25) {};
		\node [style=none] (17) at (-5.5, -3.5) {};
		\node [style=none] (18) at (-5.75, -4) {};
		\node [style=none] (19) at (-4.25, -5.5) {};
	\end{pgfonlayer}
	\begin{pgfonlayer}{edgelayer}
		\draw (3) to (0.center);
		\draw (0.center) to (1);
		\draw (1) to (2);
		\draw (2) to (8.center);
		\draw (8.center) to (9.center);
		\draw (9.center) to (7);
		\draw (7) to (6);
		\draw (6) to (5);
		\draw (5) to (4.center);
		\draw (4.center) to (3);
		\draw (0.center) to (2);
		\draw (2) to (3);
		\draw (3) to (8.center);
		\draw (3) to (9.center);
		\draw (3) to (7);
		\draw (7) to (4.center);
		\draw (7) to (5);
		\draw [style=red] (10.center) to (11.center);
		\draw [style=red, bend right, looseness=1.25] (11.center) to (12.center);
		\draw [style=red] (12.center) to (13.center);
		\draw [style=red, bend left=60, looseness=0.75] (13.center) to (14.center);
		\draw [style=red] (14.center) to (15.center);
		\draw [style=red, bend right=60, looseness=1.25] (15.center) to (16.center);
		\draw [style=red] (16.center) to (17.center);
		\draw [style=red, bend left, looseness=0.75] (17.center) to (18.center);
		\draw [style=red] (18.center) to (19.center);
	\end{pgfonlayer}
\end{tikzpicture}
