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