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