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