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