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