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