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)(13,20)(16,30)(18,26)(22,34)(24,29)(25,36)(27,32)(28,35)(31,33) involution — undirected(5,7,9,24,10,17,20,18)(6,11,13,29,14,15,23,26)(8,16,21,36,22,31,35,32)(12,27,19,33,28,25,34,30)(5,8,20,35,10,22,9,21)(6,12,23,34,14,28,13,19)(7,16,18,32,17,31,24,36)(11,25,26,33,15,27,29,30)(2,4)(5,6)(7,11)(8,12)(9,13)(10,14)(15,17)(16,27)(18,26)(19,21)(20,23)(22,28)(24,29)(25,31)(30,32)(33,36)(34,35) 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.