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