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