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