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