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