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