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