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