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