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