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