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)(19,27)(20,23)(21,30)(22,26)(24,28)(25,32)(29,31) involution — undirected(1,3)(2,4)(5,8)(6,7)(9,11,14,15)(10,12,16,13)(17,19)(18,24)(20,27)(21,29)(22,32)(23,28)(25,31)(26,30)(1,4,6,5)(2,3,8,7)(9,12,14,13)(10,15,16,11)(18,20)(19,28)(21,32)(26,31)(1,3)(2,5)(4,8)(6,7)(9,12,14,13)(10,11,16,15)(17,20,23,18)(19,27,28,24)(21,30,32,25)(22,31,29,26)(1,3)(2,4)(5,8)(6,7)(9,10)(11,12)(13,15)(14,16)(17,21,23,32)(18,25,20,30)(19,29,28,22)(24,31,27,26)(1,5,6,4)(2,7,8,3)(9,13,14,12)(10,11,16,15)(17,22,23,29)(18,26,20,31)(19,21,28,32)(24,25,27,30)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.