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