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