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