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