\newcommand{\arrow}[2]{\path [-{Latex[scale=1]}] (#1) edge (#2);}

\begin{tikzpicture}

  \begin{scope}[every node/.style={shape=circle, fill=white, draw, inner sep=2pt}]
    \node (B) at (0,2.5) {$B$};
\node (D) at (-2.37764,0.77254) {$D$};
\node (C) at (-1.46946,-2.02254) {$C$};
\node (A) at (1.46946,-2.02254) {$A$};
\node (E) at (2.37764,0.77254) {$E$};
  \end{scope}

  \begin{scope}[every draw/.style={}]
    \draw (A) -- (C);
\draw (A) -- (E);
\draw (B) -- (D);
\draw (C) -- (E);
  \end{scope}

\end{tikzpicture}