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