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