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