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