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