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