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