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