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