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