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