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