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