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