[Nauty] Understanding Nauty

[Roger Ting]

Hi All,
    Coming from an engineering  background, i find it hard to understand 
Nauty. My works are such that
it will be valuable to fully understand Nauty. I am writing to ask what 
are the steps to understand Nauty.
I know it heavily uses group theory. Has anyone wrote a tutorial on  the 
algorithm for those who are
not so mathematical inclined ?  Any advice will be greatly appreciated.

Regards,
Roger