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