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