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