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