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