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