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