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