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