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