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