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