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