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