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