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