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