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