\begin{tikzpicture}[x=1ex,y=1ex,baseline={([yshift=-.5ex]current bounding box.center)}]
    \coordinate (v0);
    \coordinate[above left=1.5 of v0] (v1);
    \coordinate[below left=1.5 of v0] (v2);
    \coordinate[above right=1.5 of v0] (v3);
    \coordinate[below right=1.5 of v0] (v4);

    \draw (v1) to[bend left=80] (v2);
    \draw (v1) to[bend right=80] (v2);

    \draw (v3) to[bend right=80] (v4);
    \draw (v3) to[bend left=80] (v4);

    \draw (v1) -- (v3);
    \draw (v2) -- (v4);

    \filldraw (v1) circle(1pt);
    \filldraw (v2) circle(1pt);
    \filldraw (v3) circle(1pt);
    \filldraw (v4) circle(1pt);
\end{tikzpicture}%
