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