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