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