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