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