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