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