{ \newcommand{\nodea}{\node[draw,circle] (a) {$1, 6$}
;}\newcommand{\nodeb}{\node (b) {$F(3212)$}
;}\newcommand{\nodee}{\node (e) {$F(3121)$}
;}\begin{tikzpicture}[auto]
\matrix[column sep=.3cm, row sep=.3cm,ampersand replacement=\&]{
         \&         \&         \&         \& \nodea  \&        \\
 \nodeb  \&         \&         \&         \&         \& \nodee \\
};

\path[ultra thick, red] (a) edge (b) edge (e);
\end{tikzpicture}}
