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