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