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