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