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