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