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