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