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