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)(24,27)(28,33)(29,34)(30,36)(32,35)(5,6)(7,10)(8,9)(11,12)(13,15)(14,17)(16,19)(18,20)(21,22,27,34,25,29,24,26)(23,30,35,33,31,28,32,36)(2,4)(6,9)(10,12)(15,19)(17,20)(21,23)(22,28)(24,32)(25,31)(26,33)(27,35)(29,30)(34,36) involution — undirected(5,7,8,11)(6,10,9,12)(14,18)(17,20)(23,31)(28,30)(32,35)(33,36)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.