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