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