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