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)(11,15,16,13)(17,18)(19,24)(20,25)(21,23)(22,26)(27,31)(28,30)(29,32)(2,6)(7,8)(18,23)(19,20)(22,29)(24,31)(25,30)(27,28) involution — undirected(1,3,5,4)(2,7,6,8)(9,11,12,16)(10,13,14,15)(17,19,21,28)(18,24,23,30)(20,22,27,29)(25,26,31,32)(1,3,5,4)(2,7,6,8)(19,27)(20,28)(22,29)(24,31)(25,30)(26,32)(1,4,5,3)(2,8,6,7)(17,20)(18,25)(19,22)(21,27)(23,31)(24,26)(28,29)(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.