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