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