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