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