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