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