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