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