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