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