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