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