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