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