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)(19,22)(20,28)(21,25)(23,26)(24,29)(27,30)(31,32)(2,6)(4,7)(9,10)(11,15)(12,14)(13,16)(17,19)(18,22)(20,27)(21,26)(23,25)(24,29)(28,30)(31,32) involution — undirected(1,3)(2,7)(4,6)(5,8)(9,11)(10,13)(12,16)(14,15)(17,20,22,29,23,30,21,31)(18,24,25,28,26,32,19,27)(2,6)(3,8)(11,16)(13,15)(17,18)(19,21)(20,24)(22,25)(23,26)(27,31)(28,29)(30,32) involution — undirected(1,4,5,7)(2,3,6,8)(10,14)(13,15)(17,21,23,22)(18,25,26,19)(20,29,30,31)(24,27,32,28)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.