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