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