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