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