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