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