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