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