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