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