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