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