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