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