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