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