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