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