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