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