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