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)(15,19)(21,22,26,29,25,24,27,30)(23,31,34,32,33,28,35,36)(5,7,8,11)(6,9,10,12)(13,14,17,16)(15,20,19,18)(21,23,27,35,25,33,26,34)(22,28,30,32,24,31,29,36)(6,10)(9,12)(13,15,17,19)(14,18,16,20)(21,24)(22,25)(23,32)(26,29)(27,30)(28,35)(31,34)(33,36)(2,4)(13,16,17,14)(15,18,19,20)(22,24)(28,31)(29,30)(32,36)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.