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