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