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