I am very new using Tikz, I am trying to draw this graph:
\documentclass[11pt]{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}[y=.6cm, x=.6cm,font=\small]
\draw [latex-latex,dashed](0,4) -- (3,8);
\draw [latex-latex,dashed](8,8) -- (11,4);
\draw [latex-latex,dashed](3,0) -- (8,0);
\draw [latex-latex,](0,4) -- (3,0);
\draw [latex-latex,](8,0) -- (11,4);
\draw [latex-latex](3,8) -- (8,8);
\filldraw[fill=black!40,draw=black!80] (0,4) circle (2pt) node[anchor=east]{e} ;
\filldraw[fill=black!40,draw=black!80] (3,0) circle (2pt) node[anchor=north]{(23)} ;
\filldraw[fill=black!40,draw=black!80] (3,8) circle (2pt) node[anchor=south]{(12)} ;
\filldraw[fill=black!40,draw=black!80] (8,0) circle (2pt) node[anchor=north]{(132)} ;
\filldraw[fill=black!40,draw=black!80] (8,8) circle (2pt) node[anchor=south]{(123)} ;
\filldraw[fill=black!40,draw=black!80] (11,4) circle (2pt) node[anchor=west]{(13)} ;
\end{tikzpicture}
\end{document}
But I really don't like the result.
Is there an easy way to do the same graph better? Thanks.