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