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