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