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