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