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)(23,30)(24,28)(25,27)(26,31)(29,33)(32,35)(34,36) involution — undirected(1,2,3,4)(5,7)(6,10)(8,14)(9,13)(11,16)(12,17)(15,19)(18,20)(21,23)(22,26)(24,31)(25,32)(27,34)(28,30)(29,35)(33,36)(7,13)(10,16)(14,19)(17,20)(22,27)(25,33)(26,34)(28,29)(30,35)(32,36) involution — undirected(6,11)(10,16)(12,18)(17,20)(23,31)(26,30)(32,36)(34,35) involution — undirected(5,8,9,15)(6,12,11,18)(7,14,13,19)(10,17,16,20)(23,31)(26,30)(32,36)(34,35)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.