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