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