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