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