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