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