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