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