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