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