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