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