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