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