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