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