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