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