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