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