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