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