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