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