One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,6)(7,9)(8,10)(11,12)(14,16)(18,20)(21,22,26,28,25,29,24,30)(23,31,33,35,34,27,32,36)(5,7,8,11)(6,9,10,12)(13,14,17,16)(15,18,19,20)(21,23,24,32,25,34,26,33)(22,27,30,35,29,31,28,36)(6,10)(9,12)(13,15,17,19)(14,18,16,20)(22,28)(23,32)(24,26)(29,30)(33,34)(35,36)(2,4)(13,16,17,14)(15,18,19,20)(21,24,25,26)(22,28,29,30)(23,33,34,32)(27,35,31,36)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.