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