See this paper.

\documentclass{article}\usepackage{tikz}\pagestyle{empty}

\begin{document}\begin{center} \begin{tikzpicture}[style=thick] \foreach \x in {0,30,...,330} { \draw (\x:2cm) circle (2pt) -- (\x+30:2cm); } \foreach \x in {0,60,...,300} { \draw (\x:2cm) circle (2pt) -- (\x+90:2cm); } \foreach \x in {0,30,...,150} { \draw (\x:2cm) circle (2pt) -- (\x+180:2cm); } \draw (60:0.7cm) circle (2pt) -- (180:0.7cm) circle (2pt) -- (300:0.7cm) circle (2pt) -- (60:0.7cm); \end{tikzpicture}\end{center}\end{document}

See also: Original Source by Rafael

Note: The copyright belongs to the blog author and the blog. For the license, please see the linked original source blog.