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