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