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