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