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