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