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