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