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)(23,30)(24,26)(25,29)(27,31)(28,33)(32,36)(34,35)(1,2)(3,4)(5,7,10,15)(6,11,8,17)(9,19,16,14)(12,20,18,13)(2,4)(22,26)(24,33)(27,30)(28,29)(31,34)(35,36) involution — undirected(5,8,10,6)(7,13,15,20)(9,12,16,18)(11,19,17,14)(21,23,25,32)(22,27,29,35)(24,34,33,31)(26,30,28,36)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.