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