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