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