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