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