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