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