One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(13,14)(15,17)(16,18)(19,20)(21,22,26,30)(23,31,32,35)(24,27,25,29)(28,33,36,34)(2,4)(5,6)(7,10)(8,9)(11,12)(13,15,16,19)(14,17,18,20)(22,27)(24,25)(28,35)(29,30)(31,36)(33,34)(6,9)(10,12)(21,23,26,32)(22,28,30,36)(24,34,25,33)(27,35,29,31)(5,7,8,11)(6,10,9,12)(14,18)(17,20)(23,32)(28,36)(31,35)(33,34)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.