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