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