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