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