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