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