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