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