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