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)(21,25)(27,28)(31,32) involution — undirected(4,13)(6,15)(7,12)(11,14)(17,18,21,23,22,20,25,29)(19,24,27,31,28,30,26,32)(1,3,5,10)(2,6,8,15)(4,14,13,11)(7,16,12,9)(17,19,22,28)(18,24,20,30)(21,27,25,26)(23,31,29,32)(3,10)(6,15)(9,16)(11,14)(17,20,21,29,22,18,25,23)(19,24,27,31,28,30,26,32)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.