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