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