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