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