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