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