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