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)(19,28)(20,25)(21,26)(22,24)(23,29)(27,30)(31,32) involution — undirected(1,3,5,4)(2,6,7,8)(9,10)(11,15)(12,14)(13,16)(17,19,21,29)(18,23,26,28)(20,30,31,22)(24,32,27,25)(9,11)(10,13)(12,16)(14,15)(18,24)(19,29)(22,30)(23,25)(26,27)(28,32) involution — undirected(11,16)(13,15)(17,20)(18,25)(19,30)(21,31)(22,29)(23,24)(26,32)(27,28) involution — undirected(1,4,5,3)(2,6,7,8)(10,14)(13,15)(19,29)(20,31)(23,28)(25,32)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.