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)(8,14)(15,16)(17,18)(19,26)(20,24)(21,30)(22,25)(23,29)(27,31)(28,32) involution — undirected(1,3,7,15)(2,8,12,4)(5,14,6,9)(10,16,11,13)(17,18)(19,23)(20,24)(21,30)(22,25)(26,27)(28,31)(29,32)(1,4)(2,9)(3,10)(5,13)(6,16)(7,8)(11,15)(12,14)(17,19)(18,23)(20,29)(21,27)(22,28)(24,32)(25,31)(26,30) involution — undirected(1,5,7,6)(2,10,12,11)(3,14,15,9)(4,13,8,16)(17,20,22,21)(18,24,25,30)(19,27,28,29)(23,26,31,32)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.