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