\documentclass[12pt]{article} % voss_at_pstricks.de (2004-06-03)
\usepackage{pst-tree}
\pagestyle{empty}
\parindent=0pt
\begin{document}

\psset{linewidth=1.5pt,linecolor=green}
\pstree{\Tcircle[linecolor=black]{P}}{%
  \Tdot[linecolor=black]~[tnpos=l]{\shortstack{Do\\Nothing}}
  {\psset{linecolor=red}\Tdot[linecolor=black]~[tnpos=r]{\kern1em\shortstack{Sue\\No Offer\\Pursue Suit}}}
  {\psset{linecolor=red}\Tdot[linecolor=black]~[tnpos=r]{\shortstack{Sue\\No Offer\\Drop Suit}}}
  \pstree{\Tcircle[linecolor=black]{D}_{\shortstack{Sue\\Offer\\Settlement}}}{%
    \pstree{{\psset{linecolor=red}\Tcircle[linecolor=black]{P}^{Reject}}}{%
      \Tdot[linecolor=black]^{Pursue}
      {\psset{linecolor=red}\Tdot[linecolor=black]_{Drop Suit}}}
    \Tdot[linecolor=black]_{Accept}
  }
}

\end{document}
