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