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