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