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