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)(11,14)(12,15)(13,16)(17,21)(18,22)(19,23)(20,24)(25,26,29,34)(27,33,28,31)(30,39,38,35)(32,37,40,36)(1,2)(3,6)(4,5)(7,8)(9,11,13,17)(10,14,16,21)(12,19,20,18)(15,23,24,22)(25,27)(26,31)(28,29)(30,36)(32,35)(33,34)(37,38)(39,40)(11,17)(14,21)(18,19)(22,23)(25,27,29,28)(26,32,34,40)(30,37,38,36)(31,39,33,35)(2,5)(6,7)(9,12,13,20)(10,15,16,24)(11,18,17,19)(14,22,21,23)(25,28,29,27)(26,33,34,31)(30,37,38,36)(32,35,40,39)(1,3,4,8)(2,6,5,7)(10,16)(14,21)(15,24)(22,23)(27,28)(31,33)(32,40)(36,37)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.