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