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