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