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