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