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