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