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