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