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