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