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