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