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