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