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