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