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