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