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)(11,14)(12,15)(13,17)(16,20)(18,22)(19,21)(23,24)(25,26,30,34)(27,35,31,32)(28,38,29,39)(33,36,40,37)(2,5)(6,8)(9,11)(10,14)(12,19)(13,18)(15,21)(16,23)(17,22)(20,24)(25,27,30,31)(26,32,34,35)(28,36,29,37)(33,39,40,38)(1,3,4,7)(2,6,5,8)(10,15)(12,20)(14,21)(16,17)(19,24)(22,23)(25,28,30,29)(26,33,34,40)(27,36,31,37)(32,39,35,38)(11,18)(14,22)(19,24)(21,23)(25,29,30,28)(26,33,34,40)(27,37,31,36)(32,39,35,38)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.