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