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