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