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)(22,26)(24,28)(27,32)(29,33)(31,35)(34,36)(1,2,4,3)(5,7)(6,11)(8,15)(9,17)(10,16)(12,19)(13,14)(18,20)(22,27)(26,32)(29,34)(33,36)(1,3,4,2)(5,8,10,9)(6,12,13,18)(7,15,16,17)(11,19,14,20)(21,22,28,32,25,27,24,26)(23,29,35,36,30,34,31,33)(7,16)(11,14)(15,17)(19,20)(21,23)(22,29)(24,31)(25,30)(26,33)(27,34)(28,35)(32,36) involution — undirected(5,9,10,8)(6,12,13,18)(7,17,16,15)(11,19,14,20)(23,30)(29,34)(31,35)(33,36)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.