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)(11,15)(12,13)(14,16)(17,18)(19,22)(20,24)(21,23)(26,30)(27,33)(28,35)(38,40)(2,5)(6,7)(9,11,13,16)(10,14,12,15)(17,19,21,24)(18,22,23,20)(26,30)(27,33)(32,37)(34,39)(1,2)(3,6)(4,5)(7,8)(9,10,13,12)(11,15,16,14)(17,20)(18,19)(21,22)(23,24)(25,26)(27,31)(28,32)(29,30)(33,36)(34,38)(35,37)(39,40)(1,2)(3,7)(4,5)(6,8)(9,11)(10,15)(12,14)(13,16)(17,19)(18,20)(21,24)(22,23)(25,27,29,33)(26,31,30,36)(28,34,35,39)(32,38,37,40)(1,3,4,8)(2,6,5,7)(9,12,13,10)(11,15,16,14)(25,28)(26,32)(27,34)(29,35)(30,37)(31,38)(33,39)(36,40)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.