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