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