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