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