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