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