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