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