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