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