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