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