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