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