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