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