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