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