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