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