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