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