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