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