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