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