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