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