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