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