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