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