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