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