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