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