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