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