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