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