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