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