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