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