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