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