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