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