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