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