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