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