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