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