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