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