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