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