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