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