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