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