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