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