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