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