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