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