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