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