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