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)(11,16)(12,14)(13,15)(17,18,22,26,21,25,30,32)(19,27,28,20,24,23,31,29)(1,3,4,8)(2,5,6,7)(3,8)(5,7)(9,11,13,12)(10,14,15,16)(17,19,21,24)(18,23,25,27)(20,26,29,32)(22,28,30,31)(2,6)(5,7)(19,24)(20,29)(23,27)(28,31) involution — undirected(9,12,13,11)(10,14,15,16)(17,20,30,27,21,29,22,23)(18,24,32,28,25,19,26,31)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.