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