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