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