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