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