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