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