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