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