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