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