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