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