One vertex per element, one color per generator, with an edge from x to x·s.
(5,6,7,8)(9,10)(11,23)(12,27,29,37)(13,19)(14,20)(15,21)(16,22)(17,25)(18,30,36,31)(24,34,39,35)(26,33)(28,38,40,32)(1,2)(3,4)(6,8)(9,11,16,26,14,25,15,13)(10,17,22,19,20,23,21,33)(12,28,31,39,29,40,30,24)(18,34,37,38,36,35,27,32)(2,4)(6,8)(9,12)(10,18)(11,24)(13,28)(14,29)(15,31)(16,30)(17,32)(19,35)(20,36)(21,37)(22,27)(23,38)(25,39)(26,40)(33,34) involution — undirected(6,8)(9,13,15,25,14,26,16,11)(10,19,21,17,20,33,22,23)(12,28,31,39,29,40,30,24)(18,35,37,32,36,34,27,38)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.