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