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