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