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