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