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