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