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