\makeatletter

\usepackage{color}
\definecolor{orange}{rgb}{1.0, 0.5, 0.0}
\definecolor{gris}{gray}{0.75}

\def\tableofcontents{%
  \thispagestyle{fancy}%
  \section*{\contentsname}%
  \@starttoc{toc}}

\renewcommand\section{\@startsection
			{section}{1}{\z@}%
			{40pt}%
			{40pt}%
			{\normalfont\sffamily\huge\bfseries\color{orange}}}

\renewcommand\subsection{\@startsection
			{subsection}{1}{\z@}%
			{20pt}%
			{20pt}%
			{\normalfont\sffamily\Large\bfseries\color{gris}}}

\renewcommand\subsubsection{\@startsection
			{subsubsection}{1}{\z@}%
			{10pt}%
			{10pt}%
			{\normalfont\sffamily\large\bfseries\color{black}}}