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