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