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