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