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