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