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