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