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