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