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