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