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