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