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