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