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