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