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