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