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