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