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