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