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