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