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