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)(23,29)(24,33)(25,27)(26,32)(28,34)(30,35)(31,36)(13,15,16,19)(14,17,18,20)(21,23)(22,26)(24,31)(25,30)(27,36)(28,35)(29,33)(32,34)(6,9)(10,12)(15,19)(17,20)(22,27)(23,30)(28,33)(31,32) involution — undirected(2,4)(5,7,8,11)(6,10,9,12)(23,31)(24,34)(26,35)(28,33)(29,36)(30,32)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.