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