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