One vertex per element, one color per generator, with an edge from x to x·s.
(2,3)(5,6,8,12,9,13,16,11)(7,10,15,19,14,18,20,17)(21,22)(23,27)(24,29)(25,28)(26,30)(31,36)(32,34)(33,35)(1,2,4,3)(5,7)(6,10)(8,15)(9,14)(11,17)(12,19)(13,18)(16,20)(21,23,25,33)(22,27,28,35)(24,32,26,31)(29,34,30,36)(6,11)(8,16)(10,17)(12,13)(15,20)(18,19)(22,28)(23,31)(24,26)(27,34)(32,33)(35,36) involution — undirected(1,3,4,2)(7,14)(10,18)(15,20)(17,19)(21,24,25,26)(22,29,28,30)(23,32,33,31)(27,34,35,36)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.