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