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