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