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