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