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