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