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