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