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