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