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