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