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