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