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