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