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