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