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