Q:

how to set header font color in Latex

Is it possible to change the header font color in Latex? 

A:

You could have a look at the sectsty package.

The secsty package provides a set of commands for changing the fount 1 used for the various sectional headings in the standard LATEX 2ε document classes

From the manual:

Make sure you include the package in your document by saying in your
  document preamble:
      \usepackage{sectsty}
  You will then have some new commands available. For example:
      \allsectionsfont{\sffamily}
  will give you sanserif for all sectional headings.
   

Here is the full manual

