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