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