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