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