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)(18,22)(19,26)(20,29)(23,25)(28,30)(31,32)(1,3,5,4)(2,7,8,6)(10,15)(14,16)(17,18)(19,27)(20,23)(21,25)(22,29)(24,28)(26,32)(30,31)(9,12,13,11)(10,16,15,14)(18,23)(19,26)(20,29)(22,25)(24,27)(28,30)(1,4,5,3)(2,6,8,7)(17,19,21,28)(18,24,25,27)(20,30,29,26)(22,31,23,32)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.