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