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