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