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