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