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