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