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)(19,23)(20,24)(21,26)(22,25)(27,28)(29,31)(30,32)(1,3,5,4)(2,6,8,7)(9,11)(10,13)(12,15)(14,16)(17,19,22,30)(18,23,25,32)(20,31,26,27)(21,28,24,29)(1,3,5,4)(2,7,8,6)(10,14)(11,15)(17,20,22,26)(18,24,25,21)(19,27,30,31)(23,28,32,29)(10,14)(13,16)(18,25)(19,28)(21,24)(23,31)(27,32)(29,30) involution — undirected(1,4,5,3)(2,7,8,6)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.