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