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