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