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