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