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