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