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