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