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