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