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