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