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)(11,15,16,13)(17,18,22,26)(19,27,20,24)(21,32,23,25)(28,29,30,31)(2,6)(7,8)(17,18)(19,28)(20,30)(21,25)(22,26)(23,32)(24,29)(27,31) involution — undirected(1,3,5,4)(2,7,6,8)(9,11,12,16)(10,13,14,15)(17,19,22,20)(18,24,26,27)(21,29,23,31)(25,30,32,28)(1,4,5,3)(2,8,6,7)(17,20,22,19)(18,24,26,27)(21,31,23,29)(25,30,32,28)(17,21,22,23)(18,25,26,32)(19,29,20,31)(24,30,27,28)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.