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