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