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)(26,28)(27,33)(29,37)(38,40) 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)(25,26,30,28)(27,34,33,31)(29,32,37,36)(35,40,39,38)(1,3)(2,5)(4,7)(6,8)(9,11)(10,15)(12,18)(13,19)(14,16)(17,23)(20,21)(22,24)(25,26,30,28)(27,31,33,34)(29,32,37,36)(35,38,39,40)(1,2)(3,5)(4,6)(7,8)(9,11)(10,12)(13,19)(14,16)(15,18)(17,20)(21,23)(22,24)(25,27)(26,31)(28,34)(29,35)(30,33)(32,38)(36,40)(37,39) involution — undirected(1,3)(2,5)(4,7)(6,8)(9,12)(10,16)(11,18)(13,20)(14,15)(17,24)(19,21)(22,23)(25,28,30,26)(27,31,33,34)(29,36,37,32)(35,38,39,40)(9,13)(10,17)(11,19)(12,20)(14,22)(15,23)(16,24)(18,21)(25,29)(26,32)(27,35)(28,36)(30,37)(31,38)(33,39)(34,40) 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.