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