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