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