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