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