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