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