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