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