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