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