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