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