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