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