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