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