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