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