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