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