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