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