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