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