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