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