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