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