\documentclass{article}
\usepackage[usenames]{color}
\usepackage{amsmath}
\usepackage{fontspec}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{graphicx}
\usepackage{longtable}
\usepackage{wrapfig}
\usepackage{rotating}
\usepackage[normalem]{ulem}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{capt-of}
\pagestyle{empty}             % do not remove
% The settings below are copied from fullpage.sty
\setlength{\textwidth}{\paperwidth}
\addtolength{\textwidth}{-3cm}
\setlength{\oddsidemargin}{1.5cm}
\addtolength{\oddsidemargin}{-2.54cm}
\setlength{\evensidemargin}{\oddsidemargin}
\setlength{\textheight}{\paperheight}
\addtolength{\textheight}{-\headheight}
\addtolength{\textheight}{-\headsep}
\addtolength{\textheight}{-\footskip}
\addtolength{\textheight}{-3cm}
\setlength{\topmargin}{1.5cm}
\addtolength{\topmargin}{-2.54cm}
\usepackage[active, tightpage]{preview}

\usepackage{tikz}

\begin{document}
\begin{preview}
\usetikzlibrary{matrix,arrows,decorations.pathmorphing}
\begin{tikzpicture}[scale=2.5,font=\footnotesize\sffamily]
\node (A) at (2,2) {dc=test.dc=example.dc=org};
\node (B) at (0,1) {ou=aliases};
\node (C) at (1,1) {ou=people};
\node (D) at (2,1) {ou=group};
\node (E) at (3,1) {ou=smbhosts};
\node (F) at (4,1) {ou=automount};
\node (G) at (5,1) {ou=bozos};
\node (L) at (0,0) {ou=green-dept};
\node (M) at (1,0) {...};
\node (N) at (2,0) {ou=yellow-dept};
\path[-]
(A) edge node{} (B)
(A) edge node{} (C)
(A) edge node{} (D)
(A) edge node{} (E)
(A) edge node{} (F)
(A) edge node{} (G)
(C) edge node{} (L)
(C) edge node{} (M)
(C) edge node{} (N);
\end{tikzpicture}
\end{preview}
\end{document}