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)(19,22,26,31)(20,27,29,23)(21,24)(25,30)(28,32)(1,3)(2,7,10,15)(4,13)(5,14)(6,12)(8,16,9,11)(17,19)(18,22,24,31)(20,28)(21,26)(23,32,27,30)(25,29)(3,12)(7,15)(11,16)(13,14)(17,20)(18,23)(19,25)(21,29)(22,30)(24,27)(26,28)(31,32) 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.