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