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