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