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