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