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)(19,27)(20,21)(22,25)(23,26)(24,30)(28,32)(29,31) involution — undirected(1,2,5,15,6,9,4,8)(3,11,13,10,14,7,12,16)(17,18,22,20,23,26,21,25)(19,28,32,27,31,24,30,29)(1,2)(3,7)(4,8)(5,15)(6,9)(10,12)(11,14)(13,16)(17,19,23,31)(18,24,26,28)(20,29,25,27)(21,30,22,32)(1,3,4,12,6,14,5,13)(2,7,8,10,9,11,15,16)(17,20,22,26,23,25,21,18)(19,29,32,28,31,27,30,24)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.