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