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