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)(24,29)(25,27)(26,33)(28,32)(31,36)(34,35) involution — undirected(1,2,4,3)(5,7,11,10)(6,12,15,16)(8,18,9,17)(13,20,14,19)(22,27)(23,31)(29,33)(32,34)(1,3,4,2)(5,8,11,9)(6,13,15,14)(7,17,10,18)(12,19,16,20)(21,23,25,31)(22,28,27,35)(24,32,26,34)(29,36,33,30)(5,9,11,8)(6,14,15,13)(7,17,10,18)(12,19,16,20)(21,22)(23,28)(24,33)(25,27)(26,29)(30,32)(31,35)(34,36)(5,10,11,7)(6,12,15,16)(8,18,9,17)(13,19,14,20)(21,24,25,26)(22,29,27,33)(23,32,31,34)(28,36,35,30)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.