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