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