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