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