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