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