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