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