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