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