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