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