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