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