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