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)(19,20)(21,24)(22,26)(23,25)(27,29)(28,30)(31,32) involution — undirected(10,13)(11,15)(17,18)(19,27)(20,29)(21,24)(22,32)(23,28)(25,30)(26,31) involution — undirected(2,5)(6,8)(9,11,12,15)(10,14,13,16)(17,19,21,25)(18,23,24,20)(22,29,31,28)(26,30,32,27)(10,13)(14,16)(18,24)(19,25)(26,32)(28,29) involution — undirected(1,3,4,7)(2,6,5,8)(17,20,21,23)(18,25,24,19)(22,27,31,30)(26,28,32,29)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.