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