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