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