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