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