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