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