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