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