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