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