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