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