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