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