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