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