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