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