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