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