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