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