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