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