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