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