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