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