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