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)(17,18)(19,23)(20,24)(21,26)(22,25)(27,31)(28,29)(30,32) involution — undirected(1,3,6,2)(4,8,5,7)(9,11,12,16)(10,13,14,15)(17,19,22,30)(18,23,25,32)(20,28,26,31)(21,27,24,29)(10,14)(13,15)(19,27)(20,26)(21,24)(23,31)(28,32)(29,30) involution — undirected(1,4,6,5)(2,7,3,8)(10,14)(13,15)(17,20,22,26)(18,24,25,21)(19,28,30,31)(23,29,32,27)(1,5,6,4)(2,7,3,8)(11,16)(13,15)(18,25)(19,27)(21,24)(23,28)(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.