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