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