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