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