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)(19,28)(20,30)(21,31)(22,32)(23,27)(24,26)(25,29)(1,3,4,8)(2,5,6,7)(9,11)(10,13)(12,15)(14,16)(17,19,29,27,22,20,30,32,23,25,28,18,24,31,21,26)(2,6)(5,7)(11,15)(13,16) involution — undirected(2,6)(5,7)(17,20,29,32,22,25,30,18,23,31,28,26,24,19,21,27)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.