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