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