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