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