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