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