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)(11,13)(12,15)(14,16)(17,18)(19,23)(20,22)(21,24)(25,32)(26,29)(27,30)(28,31) involution — undirected(1,3,4,8)(2,5,6,7)(11,16)(13,14)(18,22)(19,25)(21,27)(23,31)(26,28)(29,32)(10,13)(11,16)(14,15)(17,19)(18,23)(20,26)(21,28)(22,29)(24,31)(25,27)(30,32) involution — undirected(2,6)(5,7)(18,22)(19,26)(24,30)(25,28) involution — undirectedA 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.