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)(11,16)(12,13)(14,15)(17,24)(18,21)(19,23)(20,22)(25,26)(27,33)(28,39)(29,30)(31,34)(32,38)(35,37)(36,40) involution — undirected(2,5)(6,7)(10,15)(12,20)(16,23)(17,21)(25,27)(26,32)(28,35)(29,36)(30,37)(31,38)(33,34)(39,40) involution — undirected(1,2)(3,6)(4,5)(7,8)(12,20)(13,22)(17,21)(18,24)(25,28,31,29)(26,30,34,39)(27,35,38,36)(32,37,33,40)(1,3,4,8)(2,6,5,7)(9,11,14,19)(10,16,15,23)(12,21,20,17)(13,18,22,24)(25,29,31,28)(26,30,34,39)(27,36,38,35)(32,37,33,40)(9,12)(10,13)(11,17)(14,20)(15,22)(16,24)(18,23)(19,21)(25,27)(26,33)(28,36)(29,35)(30,37)(31,38)(32,34)(39,40) involution — undirected(9,13)(10,12)(11,18)(14,22)(15,20)(16,21)(17,23)(19,24)(25,30)(26,28)(27,37)(29,34)(31,39)(32,35)(33,36)(38,40) 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.