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