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