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