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