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