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