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