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