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