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