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