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